# Chapter 6 - Work and Energy - Problems: 57

22.0 s.

#### Work Step by Step

The work done on the piano is mgh, assuming y=0 at the start. The work divided by the time interval equals the power. $$P=\frac{mgh}{t}$$ Solve for the time. $$t=\frac{mgh}{P}==\frac{(385 kg)(9.80 \frac{m}{s^2})(16.0 m)}{2750 W}=22.0 s$$

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